Abstract

Ewbank reported a bird-wing phase conjugator (BWPC) with incoherent beams. We report a BWPC with two coherent beams A₁ and A2 (4880 Å) incident on opposite faces of BaTiO₃ at angles θ₁ and θ₂ with the C-axis. They individually generate self-pumped phase conjugate beams A₁(t) and A₂(t) detected by detectors D₁ and D₂. With simultaneous pumping D₁ and D₂ detect [A₁(t) + Â₂(t) - Δ₁] and [A₂(t) + Â₁(t) - Δ₂], respectively. Here Â₂(t) and Â₁(t) are cross couplings and Δ₁ and Δ₂ are mutual grating erasures. It is possible by adjusting laser beam powers and therefore self-erasures δ to have [A₁(t) - δ₁] and/or [A₂(t) - δ₂] = 0. Then under simultaneous pumping one observes only cross couplings Â₁(t) and Â₂(t). Keeping θ₂ = 35.5° and θ₁ = 60.5° and A₁ = Â₂ = 3 mW, one finds [A₁(t) + Â₂(t)- Δ₁] ≃ [A₂(t) + Â₁(t) - Δ₂] ≃ 0.Using ${\widehat{\theta }}_1=43.1°$ with A₁ = A₂ = 3 mW, [A₁(t) + Â₂(t) - Δ₁] ≃ 0, while [A₂(t) + Â(t) - Δ₂ ≃ A₂(t). In general for different values of θ₁, [A₁(t) + Â₁(t) - Δ₁] and [A₂(t) + Â₂(t) - Δ₂] are not zero and one sees clearly the BWPC.

© 1989 Optical Society of America